【正确答案】 B

【答案解析】本题为细节辨认题。第二段“Because the manufacturers were making tissues in greater quantities，their production costs were lowered，so that the cost of tissues went down．”说得很清楚：由于厂家提高了产量，因而降低了生产成本，继而纸巾的价格也随之下降。